leachate generation from tsdf and its treatment options
TRANSCRIPT
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Leachate Generation from TSDF and its treatment Options
- Ayushi SharmaRoll no 123
ME-II, FOTE, MSU
Subject : Industrial Water and WasteWater TreatmentDate of Presentation : 7th March’ 2017
2 Outline
Introduction to Hazardous waste landfill and Leachate Supportive Data and figures Real Episode due to Leachate Contamination Leachate Generation Factors TSDF - Introduction TSDF – Case Study Literature Review List of Applicable leachate treatment Technologies
3 Introduction
Landfilling is the most attractive disposal route.
Landfilling is not a sustainable option. Alternative methods have residues to
be landfilled ultimately. Leachate is still a threat (For Ground
waters esp.).
4 Supportive Data* (2009)
No of Hazardous waste Generating Industries : 36,165 nos Total Hazardous waste Generated per annum : 62,32,507 Metric Tonne
Landfillable : 27,28,326 MT (43.78%) Incinerable : 4,15,794 MT (6.67%) Recyclable : 30,88,387 MT (49.55%)
No of landfilling sites at present in india : 26 nos ** Total capacity to handle Landfillable waste : 21,98,068 MT (Deficit : 5,30,258 MT)**
*National Inventory of Hazardous Wastes Generating Industries & Hazardous Waste Management in India
** Protocol for Performance Evaluation and Monitoring of the Common Hazardous Waste Treatment Storage and Disposal Facilities including Common Hazardous Waste Incinerators
- CPCB
5 Gujarat Data (Accounts for 28.76% of HW generation)
T1 : National Inventory of Hazardous Wastes Generating Industries & Hazardous Waste Management in India
T2 : Protocol for Performance Evaluation and Monitoring of the Common Hazardous Waste Treatment Storage and Disposal Facilities including Common Hazardous Waste Incinerators
- CPCB
6 The Love Canal Episode
Love Canal was named after the late 18th century entrepreneur William T. Love who envisioned a canal connecting the two levels of the Niagara River which is separated by Niagara Falls. This was to provide hydro electricity to the Niagara Region
This plan failed due to Economic Collapse. Only a part of the canal was dug. The canal was sold in public auction to the city of Niagara Falls which began using the
land as a landfill for chemical waste disposal. 21,000 tones of toxic waste dumped and covered.
The expanding city was desperate for land and started construction of residential areas and gardens.
During construction of a school, landfill got punctured. Sewers were being constructed as well.
Health reports and strange odors were reported the following years. Scientists were brought in and were able to determine that the chemicals dumped
seeped into basements and the air and were responsible for the ill health of the residents
7 Leachate Generation* (How?)
Leachate is Generated when the refuse Moisture content exceeds its field capacity. Field Capacity : The maximum moisture that is retained in a porous medium
without producing downward percolation. Moisture retention depends on Holding forces of Surface tension and capillary
action Percolation occurs when the magnitude of the gravitational forces exceeds
the holding forces
* Modeling Leachate Generation and Transport in Solid Waste LandfillsM. El-Fadel , A. N. Findikakis & J. O. Leckie
Factors affecting Leachate Generation*
Physical Influences Liquid characteristics Solid Characteristics Physical transformation
Chemical influences Solubility Chemical
transformations Biological Influences
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* USEPA Document for Management of Hazardous waste Leachate
Chemical Composition of the liquid Phase
Surface area of contact between liquid and solid medium
Contact Time pH Temperature Chemical Composition of
Solid particles Adsorption Absorption Oxidation Precipitation
Microbial population depends on :
Composition of waste Nutrient availability Toxicity Oxygen levels Temperature pH Moisture Initial population
9 Bharuch Enviro Infrastructure Limited
3 phases of Secured Landfilling 2 Incineration plants with WHRB 3rd Incineration Plant in Commissioning
10 Procedure for Waste Acceptance and Disposal
FPA : Finger Print Analysis
CA : Comprehensive Analysis
SEP : Solar Evaporation Pond
MEE : Multiple effect Evaporator
CETP : Common Effluent Treatment Plant
STP : Sewage treatment Plant
Pro
toco
l for
Per
form
ance
Eva
luat
ion
and
Mon
itorin
g of
the
Com
mon
Haz
ardo
us W
aste
Tre
atm
ent
Stor
age
and
Dis
posa
l Fac
ilitie
s in
clud
ing
Com
mon
Haz
ardo
us W
aste
Inci
nera
tors
-
CPCB
11 Waste Acceptance CriteriaSR. NO. PARAMETERS ACCETANCE
CRITERIAIF NOT MATCH
WITH CRITERIA 01 PH 4 - 12 Required for
Neutralization02 Physical state Solid Waste Rejected (If Liquid)03 PFLT Test PASS Required for Stabilization
04 Odour No Significant odourRequired for
Encapsulation in hume pipe
05 Flammability Non Flammable Required analysis of Annealing loss
06 Compatibility CompatibleRequired for
Encapsulation in hume pipe
07 LRT < 3 ml/100 gm Required for Stabilization08 Annealing loss < 20 % Required for Incineration
12 Secured Landfill
13 Other Secured landfill Photographs
Bottom-Side liner System HDPE Liner
Jetropha Vegetative Cover Vegetative Cover
14 Stabilization
BEIL is also caring out treatments like neutralization /stabilization after segregating waste and give required treatment before disposal to landfill.
15 Incinerator
Simply Burning to break down into smaller less toxic compounds
Combustion
Gas Conditioning
Energy Recovery
16 Leachate Treatment @ BEIL
The Leachate Generated The Scrubber Bleed water and the TDS wastewater from ETL is sent to Multiple Effect Evaporation System.
MEE is of 120 KL/day design capacity. Condensate has COD~5000 mg/l and TDS~5000 mg/l, which is sent to
ETL When the MEE is not able to treat all the leachate generated, untreated
Leachate is sent to ETL
17 Leachate Analysis Data (01-11-2015)Parameter Analyzed
value
BOD5 1230 mg/lCOD 19230 mg/lChloride 34989 mg/lColor 300 pt.
cobaltCopper 0.216 mg/lIron 2.314 mg/lLead 2.758 mg/lNickel 0.807 mg/lOil and Grease
3.6 mg/l
pH 7.57 mg/l
Parameter
Analyzed value
Phenolic comp
9.1 mg/l
Sulfide 78.5 mg/lSulfate 2750 mg/lTDS 59322 mg/lSS 558 mg/lTemperature 28 ºCTotal Chromium
0
Zinc 0.234 mg/lNH4-N 594 mg/lManganese 3.077 mg/l
18 Bharuch Enviro Infrastructure Limited(Study of Leachate Recycling)
Pilot Baby Landfill Developed with liner up to leachate collection.
Plant Observed for duration of 17-11-2015 to 01-02-2016
Leachate generation started after 14 days of waste dumping
19 Bharuch Enviro Infrastructure Limited(Study of Leachate Recycling)
Bharuch Enviro Infrastructure Limited(Study of Leachate Recycling) Results
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30-Nov-
2015
3-Dec-
2015
6-Dec-
2015
9-Dec-
2015
12-Dec-
2015
15-Dec-
2015
18-Dec-
2015
21-Dec-
2015
24-Dec-
2015
27-Dec-
2015
30-Dec-
2015
2-Jan
-2016
5-Jan
-2016
8-Jan
-2016
0
2
4
6
8
pH
30-Nov-
2015
3-Dec-
2015
6-Dec-
2015
9-Dec-
2015
12-Dec-
2015
15-Dec-
2015
18-Dec-
2015
21-Dec-
2015
24-Dec-
2015
27-Dec-
2015
30-Dec-
2015
2-Jan
-2016
5-Jan
-2016
8-Jan
-2016
0
100000
200000
300000
TDS(ppm)
30-Nov-
2015
3-Dec-
2015
6-Dec-
2015
9-Dec-
2015
12-Dec-
2015
15-Dec-
2015
18-Dec-
2015
21-Dec-
2015
24-Dec-
2015
27-Dec-
2015
30-Dec-
2015
2-Jan
-2016
5-Jan
-2016
8-Jan
-2016
010000200003000040000
COD(ppm)
30-Nov-
2015
3-Dec-
2015
6-Dec-
2015
9-Dec-
2015
12-Dec-
2015
15-Dec-
2015
18-Dec-
2015
21-Dec-
2015
24-Dec-
2015
27-Dec-
2015
30-Dec-
2015
2-Jan
-2016
5-Jan
-2016
8-Jan
-2016
010002000
NH3-N(ppm)
30-Nov-
2015
3-Dec-
2015
6-Dec-
2015
9-Dec-
2015
12-Dec-
2015
15-Dec-
2015
18-Dec-
2015
21-Dec-
2015
24-Dec-
2015
27-Dec-
2015
30-Dec-
2015
2-Jan
-2016
5-Jan
-2016
8-Jan
-2016
05
101520253035
Leachate Generated
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22 Processes in comparison
Coagulation Ozonation Fenton Treatment Activated Sludge process Fenton-ASP (CHEM-BIO) ASP-Fenton (BIO-CHEM)
*Hazardous waste landfill leachate treatment by combined chemical and biological techniques Eneliis Kattel, Arthur Kivi, Kati Klein, Taavo Tenno, Niina Dulova & Marina Trapido
May, 2015
23 Chemical composition of Leachate
24 Coagulation (Chemical Treatment)
Coagulant : Ferric Sulphate Jar test performed on 0.6 L sample for Dose 100-1000 mg/l 1 min fast mixing (400rpm, G=956 s-1) 30 min slow mixing (40 rpm, G= 30 s-1) 24 hours sedimentation
10% COD reduction and 2% DOC reduction observed at elevated coagulant dose (~1000 mg/l)Coagulation Process was ineffective pre-treatment technique
25 Ozonation (Chemical Treatment)
Tests performed on 0.6 L sample in a 2.6L semi-continuous reactor equipped with foam catching vessel
Reaction time : 4 hours pH : at initial pH as well as at pH 11 Ozone produced from compressed air by
Trailigaz LABO LO Ozone generator delivering gas at 1.0 L/min with conc 30 mg/l.
Air Stripping trials were carried out in same treatment conditions
26 Fenton/Fenton-based treatment(Chemical Treatment)
Batch trials performed in non-buffered solutions. With and without pH adjustments to 3 0.5 L sample taken in 1L cylinder and permanent agitation speed
applied for 24 hours. Activator FeSO4.7H2O added and after its complete dissolution, Initiator
H2O2 added H2O2/Fe+2 weight ratio = 5/1 Oxidation stopped by pH adjustment to 9 by NaOH (10 M) Settling time for Ferric hydroxycomplex : 24 hours
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• Highest organic load removal obtained at COD/H2O2/Fe+2 (w/w/w) = 1/2/0.4• Further increase in reagent dose to COD/H2O2/Fe+2 (w/w/w) = 1/4/0.8 led to
improved organic load removal, but doubled treatment cost → not economically viable
• H2O2 complete utilization observed
28 Biological Treatment
Sludge used from Municipal waste water treatment plant in the same city which was proposed to be largely adapted to higher concentrations of Hazardous substances.
Aerobic biological pre-treatment experiments performed (ASP). pH : 7.3 ± 0.2 Leachate treated with pre-adapted activated sludge
Tank Volume : 8L HRT : 3 days F/M : 0.02 gBOD7/gMLSS d.
Aerobic Biological Post Treatments with pre-adapted activated sludge Tank volume : 1 L HRT : 1-2 days F/M : 0.055-0.06 gBOD7/gMLSS d
MLSS and COD measured on Daily basis
29 Shows 85% biodegradability in 28 days Thus 15% recalcitrant estimated
contributing 120mg/l COD Reasonable to employ biological pre-
treatment
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Scientific works in this area indicate the possibility of using ultrasound for degradation of a wide range of organic as well as inorganic pollution
Ultra-sound produces cavitation bubbles in medium. These bubbles accumulate energy and volume. Cavitation bubbles collapse and release accumulated energy depending on the frequency of ultrasound applied.
Ultrasound is able to remove pollution by production of radicals in the cavitation bubbles
Ultra-sound with 22khz frequency applied for time up to 180 min
32 Methodology
• 300ml sample placed in 500ml beaker and placed in Ultrasound generating equipment
• 8 ml H2O2 (30%) added to the sample
• Degradation performed for 10,20,30,60,180 min
• Temperature rise observed from 18 ºC to 26 ºC
33 Chemical composition of leachate
Young Landfill
34
0 20 40 60 80 100 120 140 160 180 2000
500100015002000250030003500400045005000
time vs COD removal
0 20 40 60 80 100 120 140 160 180 2000
500100015002000250030003500
Time vs NH4-N removal
0 20 40 60 80 100 120 140 160 180 20002468
10121416
Time vs CN- Removal
A B
35 Other applications of Ultra-sound
Pre treatment for biological treatment → Splits relatively inert compound into smaller fractions.
Oxidation of ammonia, cyanide and toxic metals. Stabilization of sludge Sludge dewatering Removal of selected metals such as Zn, Cu and Ni
36 Applicable Leachate treatment Technologies
Filtration Flocculation Reverse Osmosis Solvent Extraction Stripping Ultrafiltration Wet Oxidation
* USEPA Document for Management of Hazardous waste Leachate
Biological Treatment Carbon Adsorption Chemical oxidation Chemical reduction Chemical Precipitation Density Separation Evaporation
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